Heating attachment for stoves



(No Model.)

L. W. TURNER.

HEATING ATTACHMENT TOR STOVES. No. 321,400. Patented June 3( 1 35. A

UNITED Srarns artnr @ittica LEW'IS V. TURNER, UF YALESVILLE, CONNECTICUT.

HEATING ATTACHMENT FOR STDVES.

SPECIFICATION forming part of Letters Patent No. 321,400, dated June 30, 1885.

Application filed November 3, 1882. (No model.)

To all whom zi may concern:

13e it known that I, Lnwrs W. TURNER, of Yalesville', in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Heating Attachments for Stoves and the like; and I do hereby declare that the following is a full, clear, and exact description thereof, whereby a person skilled in the art can make and use the same, reference being made to the accompanying drawings, and the letters oi' reference marked thereon, where- Figure 1 is a perspective view of one form of my attachment, shown in position on a stove. Fig. 2 is a view in central vertical section through an inlet and outlet pipe of one form of my improved devices, which is provided with a projection on the bottom that iits the cover-hole of a stove. Fig. 3 is a view in central vertical section through a form of my device that has a bottom without the projection shown in Fig. 2.

My improved device, considered broadly, has, in the relative size and peculiar construction of its parts, two distinct functions. The rst is to present in a comparatively closed vessel (in what I call a heating-chamber) any desired quantity of air in such a position with regard to a fire or other source of heat that the air in the chamber shall be heated by a substantially direct contact of the flames or heated air with the walls or" the chamber, and the second is to cause a strong draft through the heating chamber, that carries off the heat and renews the supply ot` fresh cold air.

To promote the tirst function, the device is similar in general arrangement to many soealled heating-drums, stove-drums,77 and air hcatersthat is, the device has a re-entrant bottoni, to which the dame or hot air is to be applied, and an annular chamber with induct and eduet pipes, as shown, for instance, in the patents to Albee, October 4, 1864, No. 497 5 Vaterbury, January 30, 1877, No. 186,911, and Oldershaw, March 13, 1877, No. 188,409.

In prior devices the removal of the air in the heatingchamber is contemplated; but the feature of my invention consists in the particular proportion between the cross-sectional area of the induct and eduet pipes, by which relative proportion the strength of draft of air through the chamber is regulated and an ef- Iiciency in velocity of tlow through the chamber and degree of heat carried from the chamber is greatly increased over that attained by any device in the prior art.

In the accompanying drawings, the letter A denotes the attachment as a whole; c, the reentrant bottom, that, in the forni shown, is conical in outline of surface, but may be of any desired shape to present increased heatingsurface over a tlat forni; B, an annular project-ion from the bottom of the device that enables it to be set into the cover-hole of a stove;

C, the eductpipe, located preferably at the center and top ofthe device, and shown in the drawings as prolonged by a conducting-pipe, E, represented by dotted lines in Fig. 1 of the drawings.

The letter D denotes the induct pipe or pipes that are attached near the bottom of the device at openings made in any desired position.

It is essential to the perfect operation of my device that the induct openings shall be formed of tubes of a lengthk more than twice he diameter and of a total area, where one or more tubes are used, of substantially one-half of the cross-sectional area of the educt-tube. I prefer to make this area of the induct-pipe exact-ly one-half (i) of the area of the educt-pipe, as by using this proportion between these parts I get the best result; but so long as this ratio is substantially one-half 1 consider that it comes within the scope ot my invention.

I have found by careful and extended ein periments that it is necessary to make the device with a re-entrant bottom, as it forms a combustion-chamber, into which,when the device is placed directly over the fire, as is the case in a majority of instances where it is used, and for which position it is especially intended, the gases and flames rise directly, and the heat is so rapidly radiated through the metallic inner walls of the chamber as to increase the heat by the more thorough combustion ot' the fuel.

I claim as my inventionm 1. As an improved article of manufacture,`

an air heating and circulating drum consisting of an :ur-chamber having a re-entrant IOO bottom and inlet and outlet pipe or pipes, the sectional area of the outlet pipe or pipes, and total cross-sectional area of the inlet-pipesbeeach inlet and outlet pipe having a length of ing substantially one-half the area of the outmore than twice its diameter, all substantially let, and each inlet and outlet pipe having a as described.

15 5 length of more than twice its diameter, all In testimony whereof Iaflix niysignatuie in substantially as described. presence of two witnesses. 2. As an improved article of manufacture, v an air heating and circulating drum consist- I LEWIS W TURNER' ing of an annular air-chamber having the tov-Witnesses: 1o tal cross-sectional area of its inlet pipe or GEORGE TERRY,

pipes substantially one-halfthe total cross- FRANK P. SMITH. 

